While im collecting funds to finish my line array Id like a set of nice bookshelves (ill be using them as computer speakers) to hold me off till I get them finished.

I just got a pair of Seas Excel W18E001s in a trade (man these are pretty) and the Seas 27TDFC (should I look at any other tweeters? remember these are just to hold me off till my line arrays are completed) are quite inexpensive and would be a worthy investment to hold me off. Would a T-amp work to power them for low level listening, or should I invest in a Crown XLS-202D?

I plan on using most of the existing equipment I have planned for the line arrays, which include the DCX2496 for crossovers and the XLS-202B for the W18E001s.

Also, I was considering buying a tiny sonotube (probably like 8-10" sonotube) and then cutting 2 slits down the side and inserting a piece of MDF to use as the baffle. From the top the sonotube would look like a C, without the baffle in place.

I dont have plans on building a subwoofer for the computer (but it may happen in the future with a Dayton RS15 and a plate amp or something along those lines), as these bookshelves would probably suffice for low level listening. Should I port them or seal them, and if I ported them how low should I port them?

Would a T-amp work to power them for low level listening, or should I invest in a Crown XLS-202D?

I plan on using most of the existing equipment I have planned for the line arrays, which include the DCX2496 for crossovers and the XLS-202B for the W18E001s.

If these speakers are run full range, you're going to be Xmax limited to ~10-20W with most program material depending on the box size/tuning/type etc. I think a little chip amp is all you need for both the highs and lows, but if you already have a XLS amp then go ahead and use that for the lows I suppose.

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I dont have plans on building a subwoofer for the computer (but it may happen in the future with a Dayton RS15 and a plate amp or something along those lines), as these bookshelves would probably suffice for low level listening. Should I port them or seal them, and if I ported them how low should I port them?

If they are going to be run full range vented is going to have more benefits than drawbacks IMO. If you add a sub later you could always plug off the vent and cram the boxes full of dampening material.

I like 0.75-1.5ft^3 range, anywhere from 25-35hz tuning depending on the room and desired bottom end loading/protection. If you want the boxes to stay a little smaller, ~0.5ft^3 tuned to ~40hz looks good to me as well.

Look at FRD of that driver... 16dB peak at 4.9K due to cone resonance. Its starts around 3.2K - 3.4K. So you need not only to damp it, but to prevent any harmonirs entering this range.
Calculanion is simple - 3.2KHz/2 = 1.6K or less for crossover frequensy
Crossover could to look as below
R1 C2 or R11 C10 used to damp 4.8K cone breakup
C3 L3 R2 used to damp a very small 1dB peak around 800Hz, so it could be easly avoided.